Communication system, communication apparatus, communication method and base station

Abstract

A communication method includes receiving broadcasting of a content intermittently by first communication system, and monitoring second communication system periodically by performing switching from the first communication system. In the first communication system, content is transmitted by being divided into packets, and transmission timings of the packets are shifted. Furthermore, timing for transmission of page message from 1x base station to each terminal is limited to a specific period during one slot cycle. EV-DO base station transmits BCMCS data during a period that does not overlap the specific period. When the page message reception timing is reached while the apparatus is receiving BCMCS data, the system is switched from EV-DO to 1x, and the reception of messages is started during the period. Thereafter, the communication system is returned to lx, and the reception of BCMCS data is resumed.

1 . A communication system, comprising: 
 a first communication system for broadcasting a content intermittently; and    a second communication system that is monitored periodically by switching from the first communication system,    wherein in the first communication system, the content is transmitted by being divided into packets, and transmission timings of the packets are shifted.    
   
   
       2 . The communication system according to  claim 1 , wherein the transmission timings of the packets are shifted for a period of time that is equal to or longer than a period for monitoring the second communication system.  
   
   
       3 . The communication system according to  claim 1 , wherein in the first communication system, a size of each of the packets is shortened for a period of time that is equal to or longer than the period for monitoring the second communication system.  
   
   
       4 . A base station for broadcasting a content by a first communication system, the base station comprising: 
 a transmitter which divides the content into packets and transmits each of the packets intermittently; and    a controller which shifts transmission timings of the packets.    
   
   
       5 . The base station according to  claim 4 , wherein the controller shifts the transmission timings of the packets for a period of time that is equal to or longer than a period for monitoring a second communication system being monitored periodically by switching from the first communication system.  
   
   
       6 . The base station according to  claim 4 , wherein the controller shortens a size of each of the packets for a period of time that is equal to or longer than the period for monitoring the second communication system.  
   
   
       7 . A communication apparatus comprising; 
 a first communication section which receives broadcast of a content intermittently;    a second communication section which monitors periodically by switching from the first communication section; and    a controller which performs a control of the switching between the first communication section and the second communication section.    
   
   
       8 . The communication apparatus according to  claim 7 , wherein the controller performs the control so that the switching is not performed when it is estimated that the first communication section is in a communication period.  
   
   
       9 . The communication apparatus according to  claim 8 , wherein the controller estimates that the first communication section is in the communication period based on an intermittent broadcasting cycle of the first communication section and a monitoring period of the second communication section.  
   
   
       10 . The communication apparatus according to  claim 7 , wherein the controller estimates a timing of the switching based on an intermittent broadcasting cycle of the first communication section and a monitoring period of the second communication section.  
   
   
       11 . The communication apparatus according to  claim 7 , wherein the controller estimates a timing of the switching by employing a monitoring timing of the second communication section as a reference.  
   
   
       12 . The communication apparatus according to  claim 7 , wherein the controller permits the first communication section to receive the broadcast of the content and starts to estimate a timing of the switching, based on program information received by the first communication section.  
   
   
       13 . The communication apparatus according to  claim 7 , wherein a monitoring period of the second communication section is longer than a receiving period of the second communication section.  
   
   
       14 . A communication method, comprising: 
 receiving a broadcast content intermittently by a first communication system;    monitoring a second communication system periodically by switching from the first communication system:    estimating a timing of the switching based on an intermittent broadcasting cycle of the first communication system and a monitoring period of the second communication system; and    controlling the switching based on the estimated timing.